What's the general consensus on mounting?
The last 15 years or so I've been flying RC 3D profiles. Anytime we had a long bell motor (bell longer than diameter) we mounted them forwards or shaft front. The reason was, if they were backplate mounted there was enough flex in the motor assembly that the bell would flex enough that the magnets would rub on the stator during violent maneuvers. Front mounting only flexed the shaft as there was minimal bending loads placed on the bell by the prop. I recall early articles in MA about E stunt and motors needing additional support. I don't recall how they were being mounted though. Just curious if this was some of the same problem.

I'm sitting here more or less ready to assemble my Brodak universal D profile mount for my Fancherish Twister  and can't decide which way to build it. Front mount or backplate style?

Thanks, Matt

The bigger diameter motors  (35 series vs 28 series) seem to help if you rear mount, if you can fit it in the plane. Shouldn't be a big problem on a profile.
Good luck.

Hi,  John.
I'm assuming  that mounting any motor in the front would be better than in the back,  BUT,  if the install requires an aft mounting and a 6oz motor, a fatter diameter shorter motor would be preferable to a smaller diameter longer motor  for the reasons discussed above.
Eric Rule has some laser cut rear bearing boxes that support the aft protruding shaft on front mount installations.  That's taking this idea even one step further....

R,
Chris

I made the call last night to front mount the motor. I'm using the Universal D mount from Brodak. I wish they'd have left a bit more material in the screw area of the mount. My motor uses the innermost holes one direction and even with a 3mm drill, they broke out barely. An extra 1/16" of material would have been sufficient and if it's in the way, a few sends with sandpaper would clear it out. I did as the instructions suggested with the wider spaced holes and brass spacer/grommet. I made a simple little tool at work to assist in forming the grommets and it worked great. Didn't think to take a pic though.
Can someone recommend a precision prop mount for a 5mm shaft? There are a ton out there but so many have terrible runout.

Thanks, Matt

I never have liked the set screw type adapters.  I always buy collet style adapters, they seem that by design they have to better centered. But that's just me.  If it runs true,  that's what really matters.